Social Work 

CQ Researcher is often the first source that librarians recommend when researchers are seeking original, comprehensive reporting and analysis on policy issues in the news.

PAIS publishes bibliographic indexes with abstracts to the public policy literature in journal articles, books, and government documents.

(only the "Research Library"--scroll about halfway down)
Proquest is a general interest database covering a wide range of subjects. The "Research Library" concentrates on academic materials.

Features in-depth reporting on vital issues, statistical and historical analyses, historic documents and primary source materials, as well as a directory of key government, nonprofit, and private organizations in each of the major policy areas.

Use this database to find congressional materials by searching abstracts, titles, indexing information and other bibliographic data.

CRS is the public policy research arm of Congress.This site aims to provide integrated, searchable access to many of the full-text CRS reports that have been available at a variety of different Web sites since 1990.

The U.S. Government Accountability Office (GAO) is an independent, nonpartisan agency that works for Congress. Often called the "congressional watchdog," GAO investigates how the federal government spends taxpayer dollars.

(via LexisNexis)

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The National Association for Welfare Research and Statistics is a nonprofit association whose purpose is to exchange ideas for the advancement of research and statistics in the field of public welfare.

The CWLA National Data Analysis System (NDAS) is the most comprehensive collection of child welfare and related data in the country. It has been in existence since 1999, covering a wide array of topics that reflect services to children and families.